Effect of ZnO and Annealing on the Hydrophobic Performance of x(ZnO)-CA-PLA

The advantages of hydrophobic surface are keeping the surface always dry, clean, and reducing fluid friction. The maintenance cost could be reduced significantly due to its naturally self-cleaning properties. Although many studies have been performed, the use of metal oxide combined cellulose acetate PLA has rarely informed. The purpose of this research was to fabricate a hydrophobic coating on a glass surface of ZnO-CA-PLA with various compositions of ZnO nanoparticles (ZnO NPs), annealing temperature, the temperature of measuring condition, and time exposure on its hydrophobicity which represented by the contact angle. The film was prepared using the spin-coating method. The crystallinity and morphology of ZnO-CA-PLA films were characterized using XRD, SEM-EDAX, and FTIR. The contact angle of hydrophobicity was measured using a digital microscope. It was revealed that the ZnO-CA-PLA composite film shows an excellent hydrophobic character. The increase of ZnO NPs gives rise to increase contact angle. A similar trend also achieved by increasing of annealing time. In contrary, the contact angle of hydrophobicity may reduce by prolonged exposure time and the increase of measuring temperature.